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diff --git a/ME_2046/HW4/S25HW4.pdf b/ME_2046/HW4/S25HW4.pdf
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diff --git a/ME_2046/HW4/hw4.py b/ME_2046/HW4/hw4.py
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+import sympy as sm
+import numpy as np
+import matplotlib.pyplot as plt
+
+sm.init_printing()
+
+print("PROBLEM 1:")
+print("part a:")
+s, z, t = sm.symbols("s z t")
+
+J, B, RHO, RADIUS, L, RESIST, T = sm.symbols(
+    "J, B, rho,  r,  L,  R, T", Real=True, Positive=True
+)
+K_T, K_B = sm.symbols("K_T,  K_b")
+
+# loop gain
+Loop_Gain = K_T * 1 / (J * s + B)
+
+# transfer function from motor current command to linear displacement (ignoring feedback)
+X_over_I = Loop_Gain * RHO / s * RADIUS
+sm.pprint(X_over_I)
+X_over_I = X_over_I.expand().simplify()
+sm.pprint(X_over_I)
+
+print("part b:")
+# recall ZOH_eq
+# G(z) = (1-z**-1) Z{L**-1{G(s)/s}}
+print("Finding inverse laplace of G/s")
+G_s = X_over_I
+sm.pprint(G_s / s)
+g_t = sm.inverse_laplace_transform(G_s / s, s, t)
+sm.pprint(g_t.expand())
+
+# make z substitution subs
+
+G_z = (1 - z**-1) * (
+    K_T * T * RADIUS * RHO / B * (z / (z - 1) ** 2)
+    - J * K_T * RADIUS * RHO / B**2
+    + J * K_T * RADIUS * RHO / B**2 * (z / (z - sm.exp(-B / J * T)))
+)
+
+sm.pprint(G_z)
+
+# part c was on the board
+print("part c")
+F = sm.Matrix([[0, RHO], [0, -B / J]])
+G = sm.Matrix([0, K_T / J])
+
+# part d
+print("part d")
+A = sm.exp(F * T)
+B = sm.integrate(A, (T, 0, T))
+sm.pprint(F)
+sm.pprint(G)
+sm.pprint(A)
+sm.pprint(B)
+print(sm.latex(A))
+print(sm.latex(B))
+
+########################################################a
+print("PROBLEM 4:")
+print("bilinear transform")
+T = 0.2  # s
+
+G_s = 10 / (s + 10)
+G_z = G_s.subs(s, 2 * (z - 1) / T / (z + 1))
+sm.pprint(G_z)
+sm.pprint(G_z.simplify())
+
+print("bilinear with warping")
+omega_star = 10  # rad/s
+G_z_warped = G_s.subs(s, (omega_star / np.tan(omega_star * T / 2)) * (z - 1) / (z + 1))
+sm.pprint(G_z_warped)
+sm.pprint(G_z_warped.simplify())
+
+# Create a frequency vector from 0 to 10 rad/s (avoid exactly 0 to prevent log(0) issues)
+omega = np.linspace(0, 10, 500)
+
+# Continuous-time frequency response (evaluate at s = j*omega)
+G_s_response = 10 / (10 + 1j * omega)
+
+# For the discrete transfer functions, substitute z = exp(j*omega*T)
+z_vals = np.exp(1j * omega * T)
+
+# Convert symbolic expressions into functions that accept numpy arrays
+G_z_func = sm.lambdify(z, G_z, "numpy")
+G_z_warped_func = sm.lambdify(z, G_z_warped, "numpy")
+
+G_z_response = G_z_func(z_vals)
+G_z_warped_response = G_z_warped_func(z_vals)
+
+
+# Helper function to compute magnitude (in dB) and phase (in degrees)
+def compute_mag_phase(response):
+    mag = 20 * np.log10(np.abs(response))
+    phase = np.angle(response, deg=True)
+    return mag, phase
+
+
+# Compute responses
+mag_s, phase_s = compute_mag_phase(G_s_response)
+mag_z, phase_z = compute_mag_phase(G_z_response)
+mag_z_warped, phase_z_warped = compute_mag_phase(G_z_warped_response)
+
+# Plot the Bode plots
+plt.figure(figsize=(10, 8))
+
+# Magnitude plot
+plt.subplot(2, 1, 1)
+plt.semilogx(omega, mag_s, label="Continuous: G(s)")
+plt.semilogx(omega, mag_z, label="Bilinear: G(z)")
+plt.semilogx(omega, mag_z_warped, label="Warped: G(z)_warped")
+plt.title("Bode Magnitude Plot")
+plt.ylabel("Magnitude (dB)")
+plt.legend()
+plt.grid(True)
+
+# Phase plot
+plt.subplot(2, 1, 2)
+plt.semilogx(omega, phase_s, label="Continuous: G(s)")
+plt.semilogx(omega, phase_z, label="Bilinear: G(z)")
+plt.semilogx(omega, phase_z_warped, label="Warped: G(z)_warped")
+plt.title("Bode Phase Plot")
+plt.xlabel("Frequency (rad/s)")
+plt.ylabel("Phase (degrees)")
+plt.legend()
+plt.grid(True)
+
+plt.tight_layout()
+plt.show()
diff --git a/ME_2046/Project/ME2046 - Project Description.pdf b/ME_2046/Project/ME2046 - Project Description.pdf
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diff --git a/NUCE_2113/lab6/exercise6_4.png b/NUCE_2113/lab6/exercise6_4.png
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diff --git a/NUCE_2113/lab6/quick_maths.py b/NUCE_2113/lab6/quick_maths.py
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+print("Experiment 6.1\n")
+measured_activity = 5.2e-6  # curies
+elapsed_time = 193.92  # s
+sigma_u1 = 35331  # counts
+background_time = 193.94  # s
+sigma_b = 558  # counts
+
+R = sigma_u1 / elapsed_time - sigma_b / background_time
+print(f"R: {R:.3e} counts / s")
+print(f"R: {R/3.7e10*1e6:.3e} microcurie")
+eps_ip = 0.101  # from figure 6.2
+f = 0.6617
+
+d = 100  # mm
+r = 38 / 2  # mm
+
+G = r**2 / 4 / d**2
+
+A = R / eps_ip / G / f
+
+print(f"G: {G:.3e}")
+print(f"A: {A:.3e} decays / s")
+print(f"A: {A/3.7e10*1e6:.3e} microcurie")
+
+A = 4.5 * 3.7e10 / 1e6
+eps_ip_est = R / A / G / f
+print(f"eps_ips: {eps_ip_est:.3e}")
+
+sigma_u1 = [10122, 11763, 14464, 17476, 22073, 28268, 38084]
+sigma_b = 130
+d = [100, 90, 80, 70, 60, 50, 40]
+t = 60  # s
+
+import numpy as np
+
+n = len(sigma_u1)
+R = np.empty(n)
+G = np.empty(n)
+eps_ip = np.empty(n)
+
+for i, value in enumerate(sigma_u1):
+    print(i, value)
+    R[i] = (value - sigma_b) / t
+    G[i] = r**2 / 4 / d[i] ** 2
+    eps_ip[i] = R[i] / A / G[i] / f
+
+print("R")
+print(R.transpose())
+print("G")
+print(G.transpose())
+print("eps_ip")
+print(eps_ip.transpose())
+
+import matplotlib.pyplot as plt
+
+plt.plot(d, eps_ip, ".b")
+plt.xlabel("Distance [mm]")
+plt.ylabel("$\epsilon_{ip}$")
+plt.grid("both")
+plt.savefig("exercise6_4.png")
+plt.show()